Play for you while you are away from keyboard for a short time, for instance if you need to take a shit, but dont want to lose your seat, you can start zynga poker bot lite, and it will take over while you empty out.

Does it work on all computers ?

It works on most windows systems from XP onwards, although on the odd occaision it might not work straight away, but that is usually down to user error, and lack of computer savvy.